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Ford focus 1.6 litre zetec se. Ignition miss.

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7 years 6 months ago #3014 by Inge Jeppesen
Ford focus 1.6 litre zetec se. Ignition miss. was created by Inge Jeppesen
New case here. Posting scope capture of the ignition primary current. Car misses at idle, and load. The coil is cracked, and this is a normal failure, but would appreciate an explanation if it shows on the capture. The amp clamp is in a 10mV\A setting.

Thanks.
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7 years 6 months ago #3029 by Tyler
Replied by Tyler on topic Ford focus 1.6 litre zetec se. Ignition miss.
Dude, that's cool! :woohoo: Never seen that before. I want to say it's an excessive resistance problem? No clue, just speculating.

Nice thinking with the amp probe, too. I know I woulda found the cracked coil and gone on to the next car, never even thought about ramping it. :blush:

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7 years 6 months ago #3030 by Inge Jeppesen
Replied by Inge Jeppesen on topic Ford focus 1.6 litre zetec se. Ignition miss.
Don't you think that over 15 amps is a bit much? The other ramps are about 6 amps. At the beginning of the slope it seems fine. Then it acts like a short. Or am I wrong?

Thanks for the input☺

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7 years 6 months ago #3052 by Tyler
Replied by Tyler on topic Ford focus 1.6 litre zetec se. Ignition miss.

Inge Jeppesen wrote: Don't you think that over 15 amps is a bit much? The other ramps are about 6 amps. At the beginning of the slope it seems fine. Then it acts like a short. Or am I wrong?

Thanks for the input☺


Crap! I didn't look at the voltage conversion :blush: Did I say resistance? I meant short ;)

Soooooo, the coil gets to a certain point of saturation, then shorts to itself?

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